README: mention script location (for "electrum", after pip install)
README: mention script location (for "electrum", after pip install)

related: #6082

vialectrum/vialectrum,wakiyamap/electrum-mona,vialectrum/vialectrum,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum,vialectrum/vialectrum,spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,wakiyamap/electrum-mona,pooler/electrum-ltc,wakiyamap/electrum-mona,wakiyamap/electrum-mona